Question

sunlight is an example of a transfer of thermal energy by ___.

expansion

conduction

convection

radiation

Explanation:

Thermal energy transfer by radiation occurs through electromagnetic waves. Sunlight travels through space (a vacuum) as electromagnetic waves. Conduction requires direct contact between materials. Convection involves the movement of fluids (liquids or gases). Expansion is a result of thermal energy (like a substance expanding when heated) but not a mode of thermal - energy transfer.

Answer:

radiation